A kind of single-mode optical fiber and its preparation method

A single-mode optical fiber and optical fiber technology, applied in the direction of glass optical fiber, clad optical fiber, glass manufacturing equipment, etc., can solve the problems of cumbersome steps, high requirements for fiber drawing, and poor uniformity of radial refractive index, etc., to achieve low loss and high efficiency area, reduce optical power density, and increase the effect of optical power intensity
CN110794509BActive Publication Date: 2020-09-11FASTEN HONGSHENG GRP CO LTD +1
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FASTEN HONGSHENG GRP CO LTD
Publication Date
2020-09-11

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A single-mode optical fiber and its preparation method. The bare optical fiber includes a core layer and a cladding layer. The core layer includes a first core layer, a second core layer, and an inner cladding layer. The relative refractive index difference of the first core layer is 0.2%≤Δ 1 ≤0.35%, the relative refractive index difference of the second core layer is 0.15%≤Δ 2 ≤0.25%, the refractive index radius of the inner cladding is 24μm~36μm, and the relative refractive index difference of the inner cladding is -0.12%≤Δ 3 ≤0%. The cladding, including the depressed cladding and the outer cladding, the relative refractive index difference of the depressed cladding is -0.40%≤Δ 4 ≤‑0.28%, the outer cladding is high hardness pure quartz casing. The two-stage sleeve and core rod are assembled and drawn on-line, and the optical fiber is annealed multiple times during the drawing process, and the surface of the optical fiber is coated with a low-modulus coating and a high-modulus coating on the outside to prepare a low-loss, large effective area, and high-strength optical fiber. The method is simple, the viscosity of the core rod can be adjusted according to the requirement, and there is no need to use a pure silicon core solution to reduce the attenuation of the optical fiber, which is conducive to large-scale production.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a single-mode optical fiber and a preparation method thereof. Background technique

[0002] As we all know, with the rapid development of optical fiber communication technology, the existing conventional G.652 optical fiber can no longer meet the requirements of high-speed optical communication backbone transmission such as 400G or even 1T. . As the main indicators and symptoms of optical fiber signal transmission, reducing fiber loss and increasing the effective area are generally considered by the industry to be the key factors to improve optical fiber transmission capacity and increase transmission distance.

[0003] At present, when the industry is used to prepare low-loss, large-effective-area optical fibers, most of them use VAD and PCVD methods to make core rods, but the refractive index of optical fibers made by VAD is difficult to control, and PCVD cannot improve the single fiber due to the influence of the size of th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More